[misiekhardcore]

Motion Length in Visualiser Tooltip

This PR adds motion length calculation and display for all linear and arc motion commands (G0, G1, G2, G3) in the 3D visualizer tooltip.

Changes

Type Definition (src/visualizer/types.ts)

Added a required length: number property to PathSegment. This ensures every segment has a computable length - even zero-length segments (full circles, no-move commands) are valid and meaningful.

Path Extraction (src/visualizer/GCodePathExtractor.ts)

The extractor now calculates length during segment creation:

• Linear moves: Euclidean distance: √((x₂-x₁)² + (y₂-y₁)² + (z₂-z₁)²)
• Arcs: Chord length from first to last interpolated point
• G28 returns: Each rapid segment's individual length

A sanity check ensures lengths are non-negative.

Tooltip Display (src/webview/components/InfoPanel.tsx)

The tooltip now shows motion length alongside existing information:

Type: Feed
Line 15: G1 X5 Y-12 Z8 F200
Feed: 200
X:0.000 Y:-12.000 Z:8.000 → X:5.000 Y:-7.000 Z:16.000
Length: 15.264
I:3.500 J:2.000
[Go to line 15]

Tests (src/test/GCodePathExtractor.test.ts)

Added 10 new test cases covering:

• Linear moves with single/multiple axes (G0, G1)
• Incremental mode lengths (G91)
• Arc chords (G2, G3) including full circles
• R-word arc format
• Multi-axis arc movement

All 1438 existing tests continue to pass.

Example Usage

Hovering over a segment now shows:

Type: Rapid
Line 10: G0 X5 Y-12 Z8
X:0.000 Y:-12.000 Z:8.000 → X:5.000 Y:-7.000 Z:16.000
Length: 15.264

The length is computed in work units (mm or inches depending on machine settings).

Testing

npm test              # All 1438 tests pass
npm run build         # Compiles successfully